VALVE GP-SEQUENCE 1141268 - Caterpillar

to Guideline For Reusable Parts and Salvage Operations, SEBF8146, "Visual Inspection of Camshafts" and Guideline For Reusable Parts and Salvage Operations, SEBF8097, "Camshaft Measurement" for information that relates to the reusability of camshafts.
Illustration 1 g00838990
(1) Camshaft drive gear (2) Camshaft (3) Diameter of the bearing journals for a new camshaft ... 69.850 0.013 mm (2.7500 0.0005 inch)Bore in the front and the rear bearings for a new camshaft ... 69.969 0.048 mm (2.7547 0.0019 inch)Bore of inner bearings for a new camshaft ... 69.982 0.061 mm (2.7552 0.0024 inch) (4) Protrusion of dowel ( 3408E) ... 8.5 0.5 mm (0.33 0.02 inch) (5) Thickness of a new thrust plate ... 4.65 0.03 mm (0.183 0.001 inch)End play of camshaft ... 0.10 to 0.25 mm (0.004 to 0.010 inch)
Illustration 2 g00839053
Follow this procedure in order to calculate the actual lobe lift:
Measure the camshaft lobe height (6) .
Measure the base circle (7) .
Subtract the base circle (Step 2) from the camshaft lobe height (Step 1). The difference is the actual lobe lift (8) .
Specified camshaft lobe lift (8) Exhaust lobe ... 8.783 mm (0.3458 inch)Inlet lobe ... 8.100 mm (0.3189 inch)The maximum permissible difference between actual lobe lift (Step 3) and the specified lobe lift (Step 4) is the following value. ... 0.05 mm (0.0012 inch)